$BD/189: RS232 Output Parity/Tape Byte temporary
Kernal-Reference:
EOR $BD : $EEC9 $FB82
LDA $BD : $EEE2 $EEF6 $FA9C $FAE1 $FB24 $FB3F $FBA6 $FBFD
LSR $BD : $FC0C
STA $BD : $EECB $EF15 $FA55 $FC01 $FC2C $FC3B $FC43 $FC52
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